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I believe that Bus-OK sells them.
Part #OK61847
It is unfortunate that nobody in any other country has the skills to manufacture them…
If I used that, it would be mere minutes until the picky pedants near me wagged their fingers and started clucking.The material used in the engine bay is the lead sandwich material which is foil faced and self adhesive, it is a sheet of lead sandwiched inside to 6mm acoustic foams and is…